He is on the books of Cobh Ramblers and wears shirt number 7. His main role on the pitch is Forward.

His latest transfer saw him join College Corinthians AFC from Cobh Ramblers via on 2025-12-31.

During the Ireland First Division 2025 campaign, oscar ahern made 6 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.